import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'
import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles.vue'
import Cate from '../components/goods/Cate.vue'
import Params from '../components/goods/Params.vue'
import GoodsList from '../components/goods/List.vue'
import Add from '../components/goods/Add.vue'
import Order from '../components/order/Order.vue'
import Report from '../components/report/Report.vue'
Vue.use(VueRouter)

const router = new VueRouter({
  routes:[
    {
      path: '/',
      redirect: '/login'
    },
    {
      path: '/login',
      component: Login
    },
    {
      path: '/home',
      component: Home,
      redirect: '/welcome',
      children:[
        {
          path: '/welcome',
          component: Welcome
        },
        {
          path: '/users',
          component: Users
        },
        {
          path: '/rights',
          component: Rights
        },
        {
          path: '/roles',
          component: Roles
        },
        {
          path: '/categories', //地址
          component: Cate  //指定渲染的组件
        },
        {
          path: '/params',
          component: Params
        },
        {
          path: '/goods',
          component: GoodsList
        },
        {
          path: '/goods/add',
          component: Add
        },
        {
          path: '/orders',
          component: Order
        },
        {
          path : '/reports',
          component: Report
        }
      ]
    }
  ]
})

export default router

//挂载路由导航守卫
//为路由对象添加beforeEach 导航守卫
router.beforeEach((to,from,next)=>{
    // to 将要访问的路径
    // from 代表从哪个路径跳转而来
    // next 函数 表示 放行 
    // next() 放行  next('/login') 强制跳转

    //如果用户访问的是登录页 直接放行
    if(to.path === '/login') return next();
    //如果访问的是登录之后的页面，就要获取token 返回一个值
    const tokenStr = window.sessionStorage.getItem('token');
    //如果没有 强制跳转到登陆界面
    if(!tokenStr) return next('/login');
    //如果有 则放行
    next();
})